Re: Impedance calculation rule crystal filter
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Ugg...memories of circuit analysis in college? have assaulted my brain! I bet a computer can get the answers faster than me. Gotta get back to changing my tractor tire...enjoy.
Scotty WD4PYT?
On Mon, Mar 25, 2024, 2:55 PM Gerard < kabupos@...> wrote: Hello,
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In the Ubitx V6 documentation, it is noted that the 45 Mhz filter must see an impedance of 500 Ohm on each side. See on? --->
"The 45 MHz filter needs 500 ohms termination impedance on both ports.
?We use simple L network to match the filter to either ends of the front-end and the 2nd IF mixer."  Knowing for example that the 45MHZ filter model 45M15F has a characteristic 650 ohm/ 3 PF, what is the calculation rule for the capacitor value and inductance on each side of the filter. The capacitor 0.1?F? being considered began in short circuit at this frequency.
Please complete the calculation? rule of these 2 components, if the filter is different with value 1.5KOhm and 2PF.
The rule is:....so
Values of C212, C214? and L5, L7 are....if filter 1.5KOhm / 2PF
Thanks
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Scotty R